CN105352449A - Measurement system of shape and overall size of part on the basis of machine vision and measurement testing method of shape and overall size of part on the basis of machine vision - Google Patents

Measurement system of shape and overall size of part on the basis of machine vision and measurement testing method of shape and overall size of part on the basis of machine vision Download PDF

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Publication number
CN105352449A
CN105352449A CN201510592227.4A CN201510592227A CN105352449A CN 105352449 A CN105352449 A CN 105352449A CN 201510592227 A CN201510592227 A CN 201510592227A CN 105352449 A CN105352449 A CN 105352449A
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China
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measurement
machine vision
worktable
backlight
lens barrel
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CN201510592227.4A
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Inventor
曾志强
王俊元
杜文华
段能全
董磊
林娣
贵凯
张博
王媛
汤恒
李旭
高俊华
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North University of China
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North University of China
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Priority to CN201510592227.4A priority Critical patent/CN105352449A/en
Publication of CN105352449A publication Critical patent/CN105352449A/en
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01BMEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00Measuring arrangements characterised by the use of optical means
    • G01B11/24Measuring arrangements characterised by the use of optical means for measuring contours or curvatures

Abstract

The present invention belongs to the field of the machine vision, and specifically relates to a measurement system of the shape and the overall size of a part on the basis of machine vision and a measurement testing method of the shape and the overall size of a part on the basis of machine vision. According to the invention, non-contact measurement is realized with good reliability and measurement accuracy, and the measurement of sizes such as holes, width and the like is realized through replacing of located blocks, and therefore the measurement of multi-type sizes is flexibly achieved. The measurement system provided by the invention comprises a base plate, a backlight support, a backlight, a workbench, a workbench support, a lens barrel mounting rack and a camera assembly, wherein the backlight support, the workbench support and the lens barrel mounting rack are fixed on the base plate in turn. According to the invention, the non-contact measurement is realized with good reliability and measurement accuracy, and the measurement of sizes of parts with various shapes and sizes is achieved through replacing of located blocks.

Description

A kind of machine vision External Shape, contour dimension measuring system and the measurement method of inspection
Technical field
The invention belongs to field of machine vision, specifically a kind of machine vision External Shape, contour dimension measuring system and the measurement method of inspection.
Background technology
Modern industry relates to the identification application of various inspection, production monitoring and part in producing, and current most of industry is all utilize Special caliper to measure workpiece, this measuring method belongs to contact type measurement, there is a lot of shortcoming, as slide calliper rule are wanted and absorption surface when measuring, certain damage can be had to piece surface; Human factor obvious effect, because the factors such as shake, eyesight can cause significant impact to measurement result during measurement, may there is relatively large deviation in measurement result and physical size, seriously likely occur mistake.So the mankind start to explore non-cpntact measurement, the contactless dimension measurement method of current widespread use mainly contains laser measurement method, pneumatic type contactless measurement, electric vortex type measuring method and image-type measuring method.Laser measurement method is the size value that the width X adopting dash area that laser projection to workpiece produces corresponding directly reacts measured workpiece, wherein a laser detector is arranged on workpiece rear, this device manufacture difficulty is larger, cost is higher, and optical system needs to keep clean, otherwise impact is measured, this measurement restrictive condition, can not barrier be had in the middle of it, receiver etc. be had.Pneumatic type non-cpntact measurement size signal is converted into the change of measuring gas flow in pipeline, scale value is carried out by the buoy in graduated glass tube, but it mainly measures the size of aperture or semi-closed structure, be not suitable for measuring external dimensions, and gauge head needs, near workpiece, certain action must be had to realize dimensional measurement.Electric vortex type measuring method mainly applies current vortex technology, current vortex sensor just can the position of measurement target object without the need to contacting measured piece, but carry out measurement timer must close-in measurement, can not comparatively telemeasurement be carried out, measuring accuracy is not high, and is suitable only for measurement metal parts.Image-type measuring method adopts optical microscope measuring targets to carry out the imaging of high magnification optical amplifier, then after the object image after amplification is sent into computing machine by CCD camera system, detect profile and the surface configuration size of workpiece, but image measurer is based on CCD technology, cost is high, and can not carry out on-line measurement.In sum, all there is respective deficiency in these contactless dimension measuring devices.
Along with science and technology develops rapidly, machine vision technique mainly in fields such as industry and medical science, is developing rapidly towards automation and information-based direction, makes the processing of the repeatability in industry and measurement task easily and fast to complete thus.It is more and more general that machine vision substitutes mankind eyes as the eyes of machine carry out production testing in field of industry detection, will become a kind of inexorable trend that following automated production detects.Proposing machine vision concept is the earliest in the 1950's; The research of machine vision is that machine vision is grow up in the research of robot the earliest from middle 1960s American scholar L.R. Roberts studies about the block world understanding polyhedron composition; 20 century 70 ccd image sensors occur, ccd video camera substitutes the important turning point that silicon target video camera is machine vision development; The eighties in 20th century image processing hardware technology such as CPU, DSP made rapid progress, for machine vision develop rapidly provides the foundation condition.Current most of machine vision technique is all based on CCD technology, but CCD technical costs is higher, and the CMOS low price of same specification, and show through experimental study: the Vision Builder for Automated Inspection measuring accuracy based on CMOS can reach a μm class precision, meets the dimensional measurement accuracy requirement of most part.
Although many scholars have had primary design and application to based on CMOS machine vision part dimension measurement system, can complete the measurement of part through hole and slot bottom width, its poor universality, there is the problems such as the part scope being suitable for measurement is narrower.
Be called in patent: " a kind of based on CMOS machine vision part dimension measurement system and the measurement method of inspection ", application number is: propose solution of the above problems in the patent of " 201110421930.0 ".But following problem is there is in the measuring system of this patent: 1) camera position is not fixed, and easily beat occurs during measurement; 2) position of measured workpiece can not adjust, and backlight can not adjust flexibly, can not get best backlight angle, the clear contour images of more difficult acquisition; 3) worktable cannot move freely, and can not measure the part of large-size change; 4) locating piece on worktable can not be convenient for changing, the more difficult part dimension measurement realizing different size size.
Summary of the invention
The present invention is in order to overcome above-mentioned deficiency of the prior art, propose a kind of machine vision External Shape, contour dimension measuring system and method, not only achieve non-cpntact measurement, reach good reliability and measuring accuracy, and the measurement of hole class, width equidimension can be realized by the method changing locating piece, achieve the measurement of polymorphic type size neatly.Meanwhile, the design of measuring table is more suitable for the change of locating piece, avoids the problem that surveyed part is limited.And this invention structure is simple, cost is low, and work efficiency is high, flexibly, size for the less gabarit of part, through hole, groove width can realize accurate measurement, also can carry out double measurement and realizes accurately measuring by moving up and down worktable along vertical rail in addition for the larger part of groove width.
The present invention takes following technical scheme: a kind of machine vision External Shape, contour dimension measuring system, comprise base plate, back light source bracket, backlight, worktable, the support of table, lens barrel erecting frame and CCD camera assembly, base plate is fixed with successively back light source bracket, the support of table and lens barrel erecting frame.
The bracket fixing plate be connected with base plate is provided with bottom back light source bracket, bracket fixing plate symmetria bilateralis is provided with the light source levels angular adjustment groove of two arcs, the screw fixing with base plate is provided with in light source levels angular adjustment groove, back light source bracket top has been connected by screw rotating backlight supporting plate, and backlight supporting plate is fixed with backlight.
The vertical plane both sides of the support of table are provided with upright guide rail, worktable can slide up and down along upright guide rail, and slide into when needing position, worktable is fixed on the support of table by securing member, worktable can fix corresponding locating piece, and locating piece is used for fixing part to be measured;
Lens barrel erecting frame top is fixed with CCD camera assembly by bent plate, CCD camera assembly comprises object lens, lens barrel, eyepiece and CMOS camera, CMOS camera is with USB interface, USB port direct plugging-in CMOS camera is fixed on eyepiece by camera installing ring, and lens barrel center line, locating piece and backlight are on same straight line.
Be inlaid with panel in the upright guide rail of described side, panel is held out against by screw and worktable.Between upright guide rail and worktable, occur wearing and tearing, the method by lock-screw makes up wearing part, during serious wear, and replaceable panel.
Described worktable is provided with threaded hole, and locating piece is fixedly connected with worktable by threaded hole and bolt, by changing the locating piece of different structure or shape, with the needs of satisfied different parts measurement mode.
Described upright guide rail is fixedly connected with the support of table by screw, and when being for there are wearing and tearing between track and slide block, the method by lock-screw makes up wearing part.
Base plate is arranged with handle, is convenient to the movement of equipment.
The machine vision External Shape realized, contour dimension measure a method of inspection, and concrete steps are as follows:
(A1) regulate all parts of installation, CCD camera assembly is installed on lens barrel erecting frame, and the regulable control shooting focal length of the screw connected by bent plate and lens barrel erecting frame is to obtain image clearly.
(A2) workpiece for measurement is fixing on the table by suitable locating piece, make workpiece be in the correct position of measurement by the upright guide rail on adjusting operating platform support to the worktable adjustment carried out on vertical direction, by 5V direct current, backlight is powered.
(A3) system connects rear collection image, sets up grey level histogram, carries out histogram equalization, medium filtering process, and single threshold is split, and arrangement for closed configuration process and Canny rim detection, carry out matching by least square method to image border profile.
(A4) first the subroutine by adopting HALCON to provide demarcates the camera used, and namely can set up the corresponding relation between pixel value and size value; And then the subroutine called in HALCON calculates the pixel value of edge contour, then according to the result of demarcating, the dimensional measurement of part can be completed.
The present invention not only can realize appearance profile dimensional measurement and tolerance range judges, also the measurement of micro-, thin through-hole aperture can be completed, the workpiece calibration that different locating pieces can meet various shape, specification size is installed on the table, the shape of locating piece can make according to the shape of surveyed workpiece, and can be equipped with corresponding location-plate and fixed by workpiece.
The present invention improves further, and machine vision part dimension measurement system comprises base plate, lens barrel erecting frame, bent plate, worktable and support thereof, backlight, backlight supporting plate, back light source bracket, vertically regulates guide rail, imaging system etc.; Described imaging system comprises CCD camera assembly, lens barrel erecting frame; Described CCD camera assembly comprises eyepiece, object lens, lens barrel, CMOS camera, and described CMOS camera is with USB interface, and USB port direct plugging-in CMOS camera is fixed on CCD camera assembly tail end by camera installing ring; Described CCD camera assembly is by the V-type groove on lens barrel erecting frame and have flexible bent plate and be fixed on lens barrel erecting frame, and lens barrel erecting frame is fixed by screws on base plate; The sharpness of imaging can regulate by regulating the screw between bent plate and lens barrel erecting frame to carry out front and back to lens barrel, thus the distance changing measured workpiece and imaging system realizes.The described support of table is fixedly mounted on base plate, and described worktable, by vertically regulating guide rails assembling on the support of table, can carry out up-down adjustment according to the different measuring position of surveyed workpiece vertical adjustment on guide rail; Described backlight is arranged on backlight supporting plate by screw, described backlight supporting plate is connected on back light source bracket, described back light source bracket is arranged on base plate by screw, the swing of backlight both direction can be realized by the screw between backlight supporting plate and backlight, the angular setting of backlight surface level can be realized by the screw between back light source bracket and base plate, what the angular setting of backlight both direction can adjust best backlight injects angle, is convenient to obtain clear reliable image outline.
The part dimension measurement system of machine vision of the present invention, through experimental analysis, this system repeatability precision is high, and the linearity is good, and the measuring precision is little by the impact of time and temperature, and measuring accuracy can reach the requirement of micron order measuring accuracy; This system can be used in the part dimension measurement of difformity, different size, of many uses; This system can also be used for online part dimension measurement, economical convenient.
The invention has the beneficial effects as follows: the present invention can realize non-cpntact measurement, good reliability and measuring accuracy can be reached, the measurement of accessory size that locating piece realizes various shape, all size size can be changed, and this invention structure is simple, low cost of manufacture, work efficiency is high, flexibly, not only can realize the measurement of appearance profile size, groove width wall thickness, also can complete small through hole inside diameter measurement, also can realize the wide accurate measurement of larger slot by second measurement.
Compared with background technology, the present invention has the following advantages:
One, camera position is fixed, and optical axis is fixed, and beat can not occur during measurement;
Two, worktable moves up and down is all slide on upright guide rail, is not originally simply to move in groove, and positional precision improves;
Three, the moving up and down of worktable, and light source and camera do not move, and can adapt to the measurement of large-size change part during measurement;
Four, to different types of part, the measurement of this instrument can after changing frock, be adapted to very soon;
Five, backlight rotatable adjustment in the two directions, thus the angle changing backlight, collect optimum, most suitable image;
Six, on worktable, the replacing of locating piece realizes the measurement of the part of different size size, enhances its versatility.
Accompanying drawing explanation
Fig. 1 is the overall framework figure of the automated part Size Measuring System of machine vision;
Fig. 2 is the structural representation of machine vision External Shape, contour dimension measuring system;
Fig. 3 is that in embodiment 1, measured workpiece fixes schematic diagram on the table;
Fig. 4 is that in embodiment 2, measured workpiece fixes schematic diagram on the table;
Fig. 5 carries out to image border profile the image that matching obtains by least square method in embodiment 1;
Fig. 6 carries out to image border profile the image that matching obtains by least square method in embodiment 2;
Fig. 7 is back light source bracket vertical plane rotation figure I;
Fig. 8 is back light source bracket vertical plane rotation figure II;
Fig. 9 is back light source bracket surface level rotation figure I;
Figure 10 is back light source bracket surface level rotation figure II;
Figure 11 is back light source bracket surface level rotation figure III;
Figure 12 is back light source bracket surface level rotation figure IV;
Figure 13 is back light source bracket vertical direction schematic diagram when not rotating;
Figure 14 is back light source bracket horizontal direction schematic diagram when not rotating;
Figure 15 is support of table schematic diagram I;
Figure 16 is support of table schematic diagram II;
Figure 17 is support of table schematic diagram III;
Figure 18 is schematic diagram on the table when taking notch lower limb in embodiment 3;
Figure 19 is schematic diagram on the table when taking notch coboundary in embodiment 3;
Figure 20 is the image taking notch lower limb in embodiment 3;
Figure 21 is the image taking notch coboundary in embodiment 3;
1-base plate in figure, 2-back light source bracket, 2.1-bracket fixing plate, 2.2-light source levels angular adjustment groove, 3-backlight supporting plate, 4-backlight, 5-locating piece, 6-worktable, 7-upright guide rail, the 8-support of table, 9-object lens, 10-lens barrel, 11-bent plate, 12-lens barrel erecting frame, 13-eyepiece, 14-handle, 15-CMOS camera, 16-panel.
Embodiment
Fig. 1 gives the overall framework figure of the automated part Size Measuring System of machine vision.Image acquisition, processing section after system mixes up, can complete the image acquisition to surveyed part size edge contour to be measured, gather the binaryzation of image, filtering process, then by rim detection, obtain part survey the edge of dimensional profile image; Demarcation part, by feature extraction, the pixel value calculating surveyed target edges profile, by carrying out corresponding calculating to calibration value, can draw the size of part according to this pixel value.
As shown in Figure 2, a kind of machine vision External Shape, contour dimension measuring system, comprise base plate 1, back light source bracket 2, backlight 4, worktable 6, the support of table 8, lens barrel erecting frame 12 and CCD camera assembly, base plate 1 is fixed with successively back light source bracket 2, the support of table 8 and lens barrel erecting frame 12.
As seen in figures 8-14, the bracket fixing plate 2.1 be connected with base plate is provided with bottom back light source bracket 2, bracket fixing plate 2.1 symmetria bilateralis is provided with the light source levels angular adjustment groove 2.2 of two arcs, the screw fixing with base plate 1 is provided with in light source levels angular adjustment groove 2.2, back light source bracket 2 top has been connected by screw rotating backlight supporting plate 3, backlight supporting plate 3 is fixed with backlight 4.
As shown in Figure 15,16,17, the vertical plane both sides of the support of table 8 are provided with upright guide rail 7, worktable 6 can slide up and down along upright guide rail 7, slide into when needing position, worktable 6 is fixed on the support of table 8 by securing member, worktable 6 can be fixed corresponding locating piece 5, locating piece 5 is for fixing part to be measured;
Lens barrel erecting frame 12 top is fixed with CCD camera assembly by bent plate 11, CCD camera assembly comprises object lens 9, lens barrel 10, eyepiece 13 and CMOS camera 15, CMOS camera 15, CMOS camera 15 is with USB interface, USB port direct plugging-in CMOS camera is fixed on eyepiece 13 by camera installing ring, and lens barrel center line, locating piece and backlight are on same straight line.
As shown in Figure 15,16,17, be inlaid with panel 16 in the upright guide rail 7 of described side, panel 16 is held out against by screw and worktable.
Described worktable 6 is provided with threaded hole, and locating piece is fixedly connected with worktable 6 by threaded hole and screw.
Described upright guide rail 7 is fixedly connected with the support of table 8 by screw.
Base plate 1 is arranged with handle 14.
The machine vision External Shape realized, contour dimension measure a method of inspection, and concrete steps are as follows:
(A1) regulate all parts of installation, CCD camera assembly is installed on lens barrel erecting frame, and the regulable control shooting focal length of the screw connected by bent plate and lens barrel erecting frame is to obtain image clearly;
(A2) workpiece for measurement is fixing on the table by suitable locating piece, make workpiece be in the correct position of measurement by the upright guide rail on adjusting operating platform support to the worktable adjustment carried out on vertical direction, by 5V direct current, backlight is powered;
(A3) system connects rear collection image, sets up grey level histogram, carries out histogram equalization, medium filtering process, and single threshold is split, and arrangement for closed configuration process and Canny rim detection, carry out matching by least square method to image border profile;
(A4) first the subroutine by adopting HALCON to provide demarcates the camera used, and namely can set up the corresponding relation between pixel value and size value; And then the subroutine called in HALCON calculates the pixel value of edge contour, then according to the result of demarcating, the dimensional measurement of part can be completed.
Below in conjunction with specific embodiment, the present invention is described in detail.
Enumerate two below to measure embodiment 1,2,3 couples of the present invention and do and more describe in detail.
Embodiment 1
The measuring method of fine through-hole aperture.A kind of machine vision part dimension measurement system is by base plate, lens barrel erecting frame, bent plate, worktable and support thereof, backlight, backlight supporting plate, back light source bracket, vertically regulate guide rail, imaging system etc. to form, imaging system is made up of CCD camera assembly and camera mounting blocks, and USB port direct plugging-in CMOS camera is fixed on CCD camera assembly tail end by camera installing ring.CCD camera assembly is installed on lens barrel erecting frame, measured workpiece is fixing on the table by locating piece as shown in Figure 3, worktable can move up and down along upright guide rail and make surveyed edge of work profile be imaged on the zone line of image, can adapt to the dimensional measurement requirement of different part thus; The sharpness of imaging can pass through the installation site of adjustment mounting blocks and camera mounting blocks, thus the distance changing measured workpiece and imaging system realizes.
Concrete measuring method is: after the good all parts of mounting and adjusting, connected system, gather image, set up grey level histogram, carry out histogram equalization, medium filtering process, single threshold is split, arrangement for closed configuration process and Canny rim detection, carry out matching by least square method to image border profile and obtain image as shown in Figure 5; First the subroutine provided by adopting HALCON demarcates the camera used, and namely can set up the corresponding relation between pixel value and size value; And then the subroutine called in HALCON calculates the pixel value of edge contour, then according to the result of demarcating, the dimensional measurement of part can be completed.
Embodiment 2
The measuring method of dovetail groove slot bottom width.A kind of machine vision part dimension measurement system is by base plate, lens barrel erecting frame, bent plate, worktable and support thereof, backlight, backlight supporting plate, back light source bracket, vertical adjustment guide rail, the compositions such as imaging system, imaging system is made up of CCD camera assembly and lens barrel erecting frame, CCD camera assembly comprises eyepiece, object lens, lens barrel and CMOS camera, described back light source bracket is arranged on substrate by screw, described backlight supporting plate is connected on back light source bracket, described backlight is arranged on backlight supporting plate by screw, the described support of table is fixedly mounted on base plate, described worktable is by vertically regulating guide rails assembling on the support of table, the described support of table is fixedly mounted on base plate, described worktable is by vertically regulating guide rails assembling on the support of table, measured workpiece is fixing on the table by different locating pieces as shown in Figure 4.By the adjustment of the screw between back light source bracket and substrate and the screw between backlight and backlight supporting plate, back light source brightness is finely tuned when measuring dovetail groove slot bottom width, the support of table there is upright guide rail, worktable is mobile on upright guide rail finds out best measurement position, and final measurement obtains image as shown in Figure 6.First the subroutine provided by adopting HALCON demarcates the camera used, and namely can set up the corresponding relation between pixel value and size value; And then the subroutine called in HALCON calculates the pixel value of edge contour, then according to the result of demarcating, the dimensional measurement of part can be completed.
Embodiment 3
The measuring method of body conduction band groove width.A kind of machine vision part dimension measurement system is by base plate, lens barrel erecting frame, bent plate, worktable and support thereof, backlight, backlight supporting plate, back light source bracket, vertical adjustment guide rail, the compositions such as imaging system, imaging system is made up of CCD camera assembly and lens barrel erecting frame, CCD camera assembly comprises eyepiece, object lens, lens barrel and CMOS camera, described back light source bracket is arranged on substrate by screw, described backlight supporting plate is connected on back light source bracket, described backlight is arranged on backlight supporting plate by screw, the described support of table is fixedly mounted on base plate, described worktable is by vertically regulating guide rails assembling on the support of table, the described support of table is fixedly mounted on base plate, described worktable is by vertically regulating guide rails assembling on the support of table.Measure body conduction band groove width, first body is placed on worktable, abut against and measure in V-type benchmark, the accurate location of body can be ensured, next the lower limb of body conduction band groove is made to be positioned at the center of image along upright guide rail travelling table, the image of shooting notch lower limb, as shown in figure 18; Then the coboundary of body conduction band groove is made to be positioned at the center of image along upright guide rail travelling table, the image of shooting notch coboundary, as shown in figure 19.
To the image collected, set up grey level histogram, carry out histogram equalization, filtering process, Threshold segmentation, arrangement for closed configuration process and Canny rim detection, carry out matching by least square method to image border profile, can obtain image shown in Figure 20,21.

Claims (6)

1. a machine vision External Shape, contour dimension measuring system, it is characterized in that: comprise base plate (1), back light source bracket (2), backlight (4), worktable (6), the support of table (8), lens barrel erecting frame (12) and CCD camera assembly, base plate (1) is fixed with successively back light source bracket (2), the support of table (8) and lens barrel erecting frame (12)
Back light source bracket (2) bottom is provided with the bracket fixing plate (2.1) be connected with base plate, bracket fixing plate (2.1) symmetria bilateralis is provided with the light source levels angular adjustment groove (2.2) of two arcs, the screw fixing with base plate (1) is provided with in light source levels angular adjustment groove (2.2), back light source bracket (2) top has been connected by screw rotating backlight supporting plate (3), backlight supporting plate (3) is fixed with backlight (4);
The vertical plane both sides of the support of table (8) are provided with upright guide rail (7), worktable (6) can slide up and down along upright guide rail (7), worktable (6) is fixed on the support of table (8) by securing member, worktable (6) can be fixed corresponding locating piece (5);
Lens barrel erecting frame (12) top is fixed with CCD camera assembly by bent plate (11), CCD camera assembly comprises object lens (9), lens barrel (10), eyepiece (13) and CMOS camera (15), with USB interface on CMOS camera (15), USB port direct plugging-in CMOS camera is fixed on eyepiece (13) by camera installing ring, and lens barrel center line, locating piece and backlight are on same straight line.
2. machine vision External Shape according to claim 1, contour dimension measuring system, is characterized in that: be inlaid with panel (16) in the upright guide rail (7) of described side, panel (16) is held out against by screw and worktable.
3. machine vision External Shape according to claim 1 and 2, contour dimension measuring system, is characterized in that: described worktable (6) is provided with threaded hole, and locating piece is fixedly connected with worktable (6) by threaded hole and bolt.
4. machine vision External Shape according to claim 3, contour dimension measuring system, is characterized in that: described upright guide rail (7) is fixedly connected with the support of table (8) by screw.
5. machine vision External Shape according to claim 4, contour dimension measuring system, is characterized in that: base plate (1) is arranged with handle (14).
6., based on machine vision External Shape, a contour dimension measurement method of inspection that claim 5 realizes, it is characterized in that: concrete steps are as follows:
(A1) regulate all parts of installation, CCD camera assembly is installed on lens barrel erecting frame, and the regulable control shooting focal length of the screw connected by bent plate and lens barrel erecting frame is to obtain image clearly;
(A2) workpiece for measurement is fixing on the table by suitable locating piece, make workpiece be in the correct position of measurement by the upright guide rail on adjusting operating platform support to the worktable adjustment carried out on vertical direction, by 5V direct current, backlight is powered;
(A3) system connects rear collection image, sets up grey level histogram, carries out histogram equalization, medium filtering process, and single threshold is split, and arrangement for closed configuration process and Canny rim detection, carry out matching by least square method to image border profile;
(A4) first the subroutine by adopting HALCON to provide demarcates the camera used, and namely can set up the corresponding relation between pixel value and size value; And then the subroutine called in HALCON calculates the pixel value of edge contour, then according to the result of demarcating, the dimensional measurement of part can be completed; As long as all positions do not change, when placing arbitrary workpiece for measurement to measuring position, this position is limited by locating piece, just can complete the measurement of this part correspondingly-sized fast.
CN201510592227.4A 2015-09-17 2015-09-17 Measurement system of shape and overall size of part on the basis of machine vision and measurement testing method of shape and overall size of part on the basis of machine vision Pending CN105352449A (en)

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Application publication date: 20160224